Million-dollar zip codes
Here are the neighborhoods with the highest percentage of million dollar homes, according to OnBoard LLC. Unlike our last list of zips, which featured the areas with the highest percentage of households earning more than $100,000, million-dollar zip codes are heavily concentrated.

In fact, only four states are represented in the top 30. What's more, California dominates the list, with 21 zip codes in the top 30. New York followed with six, then came Connecticut with two and Florida with one.